DC signal isolators are a type of equipment widely utilized in the field of industrial automation. Their primary function is to isolate, convert, and transmit DC signals. During the contemporary industrial production process, signals need to be transmitted among various automatic instruments, control systems, and actuators. These signals include both weak small signals and powerful large signals, and their frequencies vary. In such a complex environment, the problem of signal interference becomes particularly prominent, and thus DC signal isolators emerged to address these issues.